.htaccess Wildcard Redirect With GET Variables - .htaccess

Question

I am trying to redirect all of the following URLs on my site to a new version. Here is the goal:
BEFORE (Notice that there is no '.php')
https://example.com/view?username=asdf1234
REDIRECTS TO (With '.php' and inside the 'tool' folder)
https://example.com/tool/view.php?username=asdf1234
I've tried a couple examples but can't figure it out. This is my best guess
RewriteEngine On
RewriteRule ^/view\?username=(.+) /tool/view.php?%1 [L,R=301]
Adding
RewriteEngine On
RedirectMatch ^/view(.*)$ https://example.com/tool/view.php$1
Successfully redirected but it is a 302 redirect. When I added [L,R=301] it gave a 500 error.

Answer 1

You could try a negative assertion:
RewriteEngine On
RewriteCond "%{REQUEST_URI}" ^/tool/?.*$
RewriteRule ".?" "-" [S=1]
RewriteRule "^/(.*)$" "/tool/$1?%{QUERY_STRING}" [L,R=301]
The first rule states a condition that the URL begins with /tool.
The second rule states that if the first rule passes, SKIP the next 1
rule.
The third rule says to implement a redirect to /tool/(TheUrlYouVisited.whatever)
So, if the URL does not begin with /tool, the third rule will not be skipped, and thus you have your catch all redirect.
As a test, you could also just add a simple:
RedirectMatch ^/view(.*)$ http://www.example.com/tool/view$1
If that doesn't work, you know something else entirely is going on.